Type of Document Master's Thesis Author Bird, Randy Lee Author's Email Address firstname.lastname@example.org URN etd-03312005-181941 Title THE Effect of Post Exercise Nutrition on Anabolic Response to Resistance Exercise Degree Master of Science Department Human Nutrition, Foods, and Exercise Advisory Committee
Advisor Name Title Rankin, Janet L. Walberg Committee Chair Gwazdauskas, Francis C. Committee Member Webb, Kenneth E. Jr. Committee Member Keywords
- Eukaryotic Initiation Factors
- Growth Hormone
- Muscle Protein Degradation
- Muscle Protein Synthesis
Date of Defense 2005-03-25 Availability unrestricted AbstractPurpose: To determine the effect of four postexercise beverages, differing in macronutrient content, on metabolic response to an acute resistance exercise bout.
Methods: Forty male subjects performed five sets of eight repetitions at 80% 1RM for leg press and leg extension, and then consumed one of four postexercise beverages (Placebo, PL: a carbohydrate-electrolyte beverage, CE; or one of two milk-based beverages, MILK 1: 1% chocolate milk; MILK 2: a high protein milk beverage). Indicators of muscle protein synthesis (MPS) were assessed before and 1-hr after consuming a postexercise beverage. Muscle protein degradation (MPD) was examined the day before and the day of exercise.
Results: No significant differences were found among groups in MPS. The resistance exercise bout increased the amount of eIF4E•eIF4G by 4.5% 1-hr postexercise (p<0.05) without affecting the amount of eIF4E•4E-BP1. One hour after beverage consumption, serum total amino acid concentration increased for MILK 1 (p=0.003) and MILK 2 (p<0.001) but decreased for CE (p=0.028) and PL (p=0.276). Consumption of MILK 1, MILK 2, and CE significantly increased circulating levels of serum insulin (p<0.001). Serum growth hormone increased 3-fold as a result of the exercise bout but fell to baseline for all groups by 60 min (p<0.001).
Conclusion: The resistance exercise bout was anabolic as shown by the increase in the active eIF4E•eIF4G complex and serum growth hormone. Consumption of MILK 2 led to the most optimal environment for muscle anabolism; however, none of the experimental beverages influenced the measured indicators of muscle protein translation 1-hr after ingestion.
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